8 runoff points?? Are you kidding? Manual cleaning time required on a regular basis. I would have expected one only on this size setup - centrally placed, ideally at the bottom of a shallow cone. I agree 4 SBs is ridiculous - 2 maximum, and only two if you have infernal rakes. 4 SBs in anything this size will interfere with each other horribly where they cross over.
To measure flow, simply time how long it takes to transfer a known volume through a single SB, then again through 2 SBs. Pressure? How far does the spray pattern throw if not inside the vessel?
There is normally a fair bit of liquid escapes from the joints between the feed pipe and the ball - it is required to clean the SB itself and lubricate the bearing surfaces.
To measure flow, simply time how long it takes to transfer a known volume through a single SB, then again through 2 SBs. Pressure? How far does the spray pattern throw if not inside the vessel?
There is normally a fair bit of liquid escapes from the joints between the feed pipe and the ball - it is required to clean the SB itself and lubricate the bearing surfaces.
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